Chrysler Repair: Heater Control Valve, 2000 chrysler lhs, heater control valve

Question
I would like to know where the Heater Control Valve is located on a 2000 Chrysler LHS.

Answer
Hi Thomas,
There is no liquid control valve on this system, the coolant flows thru the heater core at all times. The air temp is controlled by whether or not air is allowed to flow thru the core.
The door that controls the temperature of the air at the outlets to the cabin is done by the temp (blend) door and its electrical position 'actuator'. The actuator proper is on the very bottom of the housing, at the far left end, directly above the center tunnel of the vehicle. You can remove the actuator as follows:
It is square and has a 5 wire black plug, and it has a socket that meshes with the door shaft. Note the position of the door shaft when replacing the actuator upon assembly to get the same meshing position.
Removal:
Remove left and right silencer under dash panel/ducts.
Remove two screws that hold actuator that are accessible from the right side of the center console.  Remove one screw accessible from the left side. Both are underneath.
Pull actuator straight down and unplug electrical plug.
To install reverse the procedure.
Check whether the door is free to rotate. If it is then the actuator is presumably not working. If the door is sticking, try to free it up, otherwise you may have to remove the unit in its entirety, which is a big job.
I hope this is helpful to you.
There is some self-diagnostic capability for the control system:
The control head can only be placed into the diagnostic mode while the engine is running and the vehicle is not moving. Set the control to a 75° F setting (so there is no confusion with the 23-51 Diagnostic Trouble Codes (DTC's)

To place the system into it's diagnostic mode, press and hold the Floor, Mix and Defrost buttons (at the same time) The ATC head display will begin to blink. Release the Floor, Mix and Defrost buttons. Once the control head enters the diagnostic mode, the display on the control head will continue to blink. This occurs until it completes its tests and climate control unit door/actuator calibrations. Then it will display any diagnostic trouble codes that are present in the BCM. If there are no diagnostic trouble codes, the system will return to its normal operation as indicated by the temperature symbol (a C or a F) Diagnostic trouble codes related to the ATC and climate control unit will appear on the display in numerical form. The diagnostic trouble codes are stored in the BCM and can range between 23 and 51. The ATC control can only show one diagnostic trouble code at a time. Under certain circumstances, more than one diagnostic trouble code could be in the memory. To scroll through any additional diagnostic trouble codes, press the Panel Mode button on the ATC control. It is important that no other knob or button is pushed until all codes are read. Pushing any button except Panel Mode or turning a knob will end the diagnostic test without showing the rest of the trouble codes. Let me know what trouble codes you get and whether this is a manual of automatic temp (digital readout) control unit.
Roland
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